This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
Ordinary handsaws may be brazed as follows: - Taper the ends of the saw by filing so as to form two wedge-shaped ends for about the length of three teeth. Lap the ends, and place a small quantity of the flux on them; cut off a narrow piece of the brazing metal (about 1 in. by 1/4 in. will do for an inch saw), place it between the ends of the saw, and cover the joint with flux. The saw, being clamped and held in position in a suitable holder, is now ready for brazing. Heat to a Bright red heat a pair of heavy tongs, free from scale between the jaws, and hold them tightly on the saw until the brazing metal melts; then slip off the heavy tongs, and grip the braze with a lighter pair that has been made black hot. When the joint is well set, remove the tongs and tile the braze to uniform thickness. The saw is ready for use when the teeth where the joint is made have been sharpened and set. For brazing heavy handsaws, a small machine may be used, by which the saws are kept in position over the fire by means of a hinged clamp having set-screws on each side of the joint. The brazing is done with two pairs of tongs. Brass spelter and borax as a flux makes very strong joints in band-saws of ordinary widths.
Equal parts of copper and coin-silver, melted well together, rolled out thin and cut in strips, is said to make good brazing metal. One ounce is sufficient to make over thirty joints, in bandsaws l in. wide. Two ounces of flux will be sufficient for l oz. of brazing metal.
 
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